Re: [PATCH v13 RESEND 13/14] arm64: Use generic TIF bits for common thread flags

[Linus Walleij]

On Tue, Mar 17, 2026 at 9:20 AM Jinjie Ruan <ruanjinjie@xxxxxxxxxx> wrote:

> Use the generic TIF bits defined in <asm-generic/thread_info_tif.h> for
> standard thread flags (TIF_SIGPENDING, TIF_NEED_RESCHED, TIF_NOTIFY_RESUME,
> TIF_RESTORE_SIGMASK, TIF_SINGLESTEP, etc.) instead of defining
> them locally.
>
> Arm64-specific bits (TIF_FOREIGN_FPSTATE, TIF_MTE_ASYNC_FAULT, TIF_SVE,
> TIF_SSBD, etc.) are renumbered to start at bit 16 to avoid conflicts.
>
> This enables RSEQ optimizations which require CONFIG_HAVE_GENERIC_TIF_BITS
> combined with the generic entry infrastructure (already used by arm64).
>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxx>
> Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>

Reviewed-by: Linus Walleij <linusw@xxxxxxxxxx>

Yours,
Linus Walleij